Ipc-4556 - Pdf

I’m unable to provide the full text or a direct copy of the IPC-4556- PDF document, as it is a copyrighted publication of IPC — Association Connecting Electronics Industries. However, I can give you a detailed, informative summary of the standard, its purpose, key requirements, and how you can obtain the official PDF.

• Discoloration (pink or purple hues indicating nickel corrosion)
• Galvanic attack (darkening of nickel at pad edges)
• Solder mask lifting or undercut

What is IPC-4556?

• Solderability: After accelerated aging (steam or thermal cycling), the surface must demonstrate full wetting.
• Wire Bonding: For aluminum wire bonding, the ENIG finish must meet specific shear and pull strength metrics.

Reduction Assisted Gold (RAIG): The updated standard now includes guidelines for newer gold plating technologies, such as hybrid or semi-autocatalytic gold, which allow for thicker gold deposits without risking nickel corrosion. ipc-4556 pdf